Which of the following have the highest specific charge

(1) Positron                   

(2) Proton

(3) He++                          

(4) None of these

Subtopic:  Various Atomic Models |
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The idea of matter waves was given by
(1) Davisson and Germer                 

(2) de-Broglie

(3) Einstein                                     

(4) Planck

Subtopic:  De-broglie Wavelength |
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Waves are associated with matter only:

1. When it is stationary.
2. When it is in motion with the velocity of light only.
3. When it is in motion with any velocity.
4. None of the above.

Subtopic:  De-broglie Wavelength |
 58%
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The de-Broglie wavelength associated with the particle of mass m moving with velocity v is

(1) h/mv                 

(2) mv/h 

(3) mh/v                 

(4) m/hv

Subtopic:  De-broglie Wavelength |
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A photon, an electron, and a uranium nucleus all have the same wavelength. The one with the most energy: 

(1) Is the photon

(2) Is the electron

(3) Is the uranium nucleus

(4) Depends upon the wavelength and the properties of the particle

Subtopic:  De-broglie Wavelength |
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A particle which has zero rest mass and non-zero energy and momentum must travel with a speed:

1. Equal to c, the speed of light in vacuum.
2. Greater than c.
3. Less than c.
4. Tending to infinity.

Subtopic:  De-broglie Wavelength |
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When the kinetic energy of an electron is increased, the wavelength of the associated wave will
(1) Increase

(2) Decrease

(3) Wavelength does not depend on the kinetic energy

(4) None of the above

Subtopic:  De-broglie Wavelength |
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If the de-Broglie wavelengths for a proton and an alpha-particle are equal, then the ratio of their velocities will be:
1. 4 : 1
2. 2 : 1
3. 1 : 2
4. 1 : 4

Subtopic:  De-broglie Wavelength |
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The de-Broglie wavelength λ associated with an electron having kinetic energy E is given by the expression

(1) h2mE                           

(2) 2hmE

(3) 2mhE                               

(4) 22mEh

Subtopic:  De-broglie Wavelength |
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Dual nature of radiation is shown by:

(1) Diffraction and reflection

(2) Refraction and diffraction

(3) Photoelectric effect alone

(4) Photoelectric effect and diffraction

Subtopic:  Photoelectric Effect: Experiment |
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